自酸蚀树脂水门汀ResiCem牙本质粘结强度的评价

目的 评价自酸蚀树脂水门汀ResiCem的牙本质粘结强度并探讨酸蚀对其粘结强度的影响。方法 选择离体无龋第三恒磨牙15颗。沿垂直于牙体长轴方向将磨牙冠中1/3处切开,将牙本质面分别用自酸蚀树脂水门汀Panavia F和Resi-Cem原位对位粘结。其中ResiCem组牙本质面分别用磷酸酸蚀0、5、10、15 s。用低速切片机把样本切割成约1 mm×1 mm×8mm条块后进行微拉伸测试,并通过扫描电镜观察粘结界面。结果 ResiCem的牙本质微拉伸粘结强度[(16.9±5.3)MPa]与Panavia F[(17.0±5.2)MPa]间差异无统计学意义(P>0.05)。磷酸酸蚀显著地降低ResiCem与牙本质间的粘结强度(P<0.05),并随着酸蚀时间的延长而降低。结论 ResiCem的牙本质微拉伸粘结强度与Panavia F相当,但酸蚀会降低ResiCem的牙本质粘结强度。

Micro-tensile bond strength of self-etching resin cement ResiCem to dentin

Objectives The aim of this study was to investigate the micro-tensile bond strength(TBS) of self-etching resin cement ResiCem to dentin with or without acid etching.Methods Fifteen non-carious adults′ third molars were used in the study.The crowns were cut into two perpendicularly to tooth long axis at the middle one third of crowns in order to expose the dentin surfaces of both sectioned sides.Before cementation,dentin surfaces in the Resin Cem group were acid etched for 0 s,5 s,10 s,or 15 s,respectively.The sectioned dentin surfaces were cemented with ResiCem and Panavia F separately for comparison.After 24 hours,water storage,all specimens were perpendicularly sectioned through the resin-dentin interfaces with a low-speed saw(Isomet) under water cooling.Finally,all the specimens were prepared into beams at about 1mm×1mm×8mm.Micro-tensile bond strength was tested.The resin-dentin interfaces were observed with scanning electron microscope(SEM).Results There was no significant difference of TBS to dentin between ResiCem [(16.9±5.3) MPa] and Panavia F [(17.0±5.2) MPa)](P>0.05).However,acid etching markedly reduced the dentin bond strength of ResiCem with acid etching time extending(P<0.05).Conclusions ResiCem possessed a similar dentin bond strength to Panavia F.Acid etching had detrimental effects on ResiCem bonding to dentin.